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Energy of an electron is givem by E = - ...

Energy of an electron is givem by `E = - 2.178 xx 10^-18 J ((Z^2)/(n^2))`. Wavelength of light required to excited an electron in an hydrogen atom from level `n = 1` to `n = 2` will be
`(h = 6.62 xx 10^-34 Js` and `c = 3.0 xx 10^8 ms^-1`).

A

`8.500 xx 10 ^(-7)m`

B

` 1.214 xx 10 ^(-7) m`

C

` 1.816 xx 10 ^(-7) m`

D

`6.500 x 10 ^(-7) m`

Text Solution

Verified by Experts

The correct Answer is:
B
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Energy of an electron is given by E = - 2.178 xx 10^-18 J ((Z^2)/(n^2)) . Wavelength of light required to excite an electron in an hydrogen atom from level n = 1 to n = 2 will be (h = 6.62 xx 10^-34 Js and c = 3.0 xx 10^8 ms^-1 ).

Energy of an electron in an excited hydrogen atom is -3.4eV . Its angualr momentum will be: h = 6.626 xx 10^(-34) J-s .

The ionisation energy of hydrogen atom is 1.312xx10^(6) J "mol"^(-1) . Calculate the energy required to excite an electron in a hydrogen atom from the ground state to the first excited state.